[Webkit-unassigned] [Bug 227143] New: Text effected by @font-face intermittently fails to render

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=227143

            Bug ID: 227143
           Summary: Text effected by @font-face intermittently fails to
                    render
           Product: WebKit
           Version: Safari 14
          Hardware: Mac (Intel)
                OS: macOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ian at ianbellomy.com

Created attachment 431715

  --> https://bugs.webkit.org/attachment.cgi?id=431715&action=review

Inducing the issue by changing one of two rules applied to the element.

In Safari 14.1.1 I'm seeing text disappearing and reappearing when its computed styles are updated. I'm having a heck of a time isolating it but best I can tell it seems tied to @font-face somehow. The issue is not present in FF or Chrome. 

I'm including a video example of behavior as best I've been able to isolate it. Have tried to create a stripped down stand-alone file with no luck so far.

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